How to make hotspot wifi greeting on debian?

Question

Nginx

Good afternoon.
I found about 10 solutions to this issue on the Internet, but all of them are either with authorization, or with data entry, or are so complicated, incomprehensible, crooked that I didn’t even consider it.
I used hostapd to configure wi-fi as an access point, DHCP, nginx, iptables are also installed.
do not offer dnsmasq.
You just need to connect, when you enter any address, redirect to the site the page that is located in nginx, then click OK and continue working on the Internet.

Answer 1

The essence is simple, you need a firewall rule that wraps all requests from users port 80 to a local page and the page itself with a button that, when pressed, redirects to the original site + adding the current user's IP to the table that we do not redirect. In total, you will need a firewall, a database with a list of users who should not be wrapped, and a page with a button, but since you have not mastered the simplest manuals with ready-made solutions and could not even google CaptivePortal, I'm afraid this answer will not help you. Here is the simplest implementation https://xakep.ru/2013/10/29/captive-portal/

Answer 2

Thanks for the advice, but I already found this manual. I'm most interested in this option habrahabr.ru/post/119695 - the only thing that I don't understand about it is point 2 at the beginning - a set of rules for the firewall. How to translate this into commands for entering yourself in iptables.